package com.killLog.service.impl;

import com.killLog.dto.GoodsSalesDTO;
import com.killLog.entity.Orders;
import com.killLog.mapper.OrderMapper;
import com.killLog.mapper.UserMapper;
import com.killLog.service.ReportService;
import com.killLog.service.WorkspaceService;
import com.killLog.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /*统计指定时间区间内的营业额数据*/
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放begin-end日期范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期后一天对应的日期
            begin = begin.plusDays(1);//往后移一天
            dateList.add(begin);//把begin-end日期范围内的每天的日期存进去
        }
        String dateString = StringUtils.join(dateList, ",");//取出dateList的每个元素，并且以,分隔然后拼接成字符串

        //当前集合用于存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额的数据，营业额指 状态为"已完成“的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);//带时分秒的begin
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);//带时分秒的end
            /*
            select sum(amount) from orders where order_time > beginTime and order_time < endTime and status =5
            */
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);//5已完成
            Double turnover = orderMapper.sumByMap(map);//使用map集合来封装这些条件
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateString,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id) from user where create_time<? and create_time>?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量 select count(id) from user where create_time<?
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);//带时分秒的开始日期
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);//带时分秒的结束日期

            Map map = new HashMap();
            map.put("end",endTime);
            Integer totalUser = userMapper.cuntByMap(map);/*总用户数量*/
            map.put("begin",beginTime);
            Integer newUser = userMapper.cuntByMap(map);/*新增用户数量*/

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        //封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    /*统计指定时间区间内的订单数据*/
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询订单总数 select count(id) from orders where order_time > ？ and order_time < ？
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            //查询每天的有效订单数 select count(id) from orders where order_time > ？ and order_time < ？and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount!=0) {
             orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }


    /**
     * 统计指定时间区间内的销量排名前10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        //封装返回结果数据
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {//后端响应给前端的数据是封装在response里面的
        //1.查询数据库，获取营业数据---最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);//今天往前推30天，就是最近30天
        LocalDate dateEnd = LocalDate.now().minusDays(1);//往前推一天，就是昨天
        LocalDateTime beginTime = LocalDateTime.of(dateBegin, LocalTime.MIN);//起始时间的带时分秒年月日的形式（MIN:0时0分0秒）
        LocalDateTime endTime = LocalDateTime.of(dateEnd, LocalTime.MAX);//结束时间带时分秒年月日的形式（MAX:23时59分59秒）
        /*查询概览数据*/
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(beginTime, endTime);

        //2.通过POI将数据写入到excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            /*基于已有的模板excel文件在内存中创建一个新的excel文件*/
            XSSFWorkbook excel = new XSSFWorkbook(in);
            /*往创建的excel中填充概览数据*/
            //1.获取标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //2.1 往第2行第2个单元格填充时间数据
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);
            //2.2 填充第4行对应的数据
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());/*第2个单元格*/
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());/*第5个单元格*/
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());/*第7个单元格*/
            //2.3 填充第5行对应的数据
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());/*第3个单元格*/
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());/*第5个单元格*/

            /*往创建的excel中填充明细数据*/
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);//起始时间退后i天，即循环得到最近30天的每一天
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3.通过输出流将excel文件下载到浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //4.关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
